Changes about build container

[alejandro-kid]

• Delete application.docker.yml: Now the config/application.yml will be create inline using an script when the container run. For this purpose need declared two environment variables HOMEPAGE and ADMIN_UI.

  Note: The main conclusion of all my test is that in application.yml need to have both env variables (HOMEPAGE and Cenit::Admin:default_uri), even if HOMEPAGE is not in it, the platform will not redirect correctly.

• Update docker-compose.yml: Here I deleted the configuration of NGINX. Docker compose is not for productions, so dont have sense configure NGINX, i remove this element to do the file more simple.
• Enable build container in developer branch and redefine tags of container: I think that the best way to resolve a bug is knowin where is it. For this reason I configured a system of tags, the tags of master branch will be latest and a short sha (the first 7 numbers), because with the current tag when a new container is pushed override the previusly. And in developer branch the container will have a tag as following: developer-${SHA}